74LS Synchronous 4-bit Binary Counters. These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and.
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For a circuit board with a ground plane, the usual guideline is at least one cap per 5 ICs. So your outputs should be connected like.
As further issues arise I see myself stuck once more with a dysfunctional circuit. Home Questions Tags Users Unanswered.
I added a 0. Sign up or log in Sign up using Google. In that case, datawheet the signals going to your LEDs. WhatRoughBeast 49k 2 28 You can often get away with less, but as you’ve just learned, insufficient decoupling can have weird symptoms. That’s probably causing as much trouble as no debounce was.
Whenever I press the clock button I get all of the leds on except maybe one or two, with some flashing during the button press. I’m still getting the same effect. Since you already need one section of aand there are 6 gates per IC, you simply go.
Then I used a pullup resistor for the clear switch. Oh, Ill change that and see what happens. You may object that this will provide LEDs which are on when the output is low, and off when the outputs are high, which is confusing. Okay I wired 7,9, and 10 together and then connected them to a 1K resistor to 5V. TTL works much better pulling loads down. It’s always the simple things.
For breadboards, use a cap for daasheet IC.
N 4-bit counter not counting properly – Electrical Engineering Stack Exchange
Email Required, but never shown. Since you already need one section of datashfetand there are 6 gates per IC, you simply go simulate this circuit.
Get into the habit now. Also, have you added a 0. So your outputs should be connected like simulate this circuit — Schematic created using CircuitLab You may object that this will provide LEDs which are on when the output is low, and off when the outputs are high, which is confusing.
Finally, you should not count on TTL outputs driving high, as you have shown. I’d reduce that down to something in the nF to 1uF range. Sign up using Facebook.